Although flash can sometimes cause 'washed-out' backgrounds deprived of good details like in your second shot of the swamphens, the heron photo is really good. I like the cobalt blue feathers and the full pose in general. Maybe that's because there's more depth in the background of the heron which absorved the light and brought the heron to attention, whereas the light completely got reflected from the rocks behind the swamphens and lost the depth.
Do these birds react to flash lights afterwards?
For someone who doesn't see such wild birds in everyday life that's rather majestic for me.
My wildest environment of birds consist of chirpy sparrows, seagulls and some run-away sparrows from a park close-by.